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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy >
Vol.XIX, No.4 >
Petrography and Mineralogy of Xenoliths from the Yatsugatake Volcanic Chain, Central Japan I. Ti-Garnet
| Title: | Petrography and Mineralogy of Xenoliths from the Yatsugatake Volcanic Chain, Central Japan I. Ti-Garnet |
| Authors: | Oba, Takanobu Browse this author | | Kawachi, Shimpei Browse this author |
| Issue Date: | Feb-1981 |
| Publisher: | 北海道大学 |
| Journal Title: | 北海道大学理学部紀要 |
| Journal Title(alt): | Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy |
| Volume: | 19 |
| Issue: | 4 |
| Start Page: | 485 |
| End Page: | 494 |
| Abstract: | Calc silicate xenoliths from the Yatsugatake Volcanic Chain have representative mineral assemblage of Ti-garnet + fassaitic pyroxene + anorthite + sphene ± iron ores ± vesuvianite ± wollastonite ± corundum ± calcite. Garnet is schorlomite (TiO2 = 11.87 wt %) with the formula of Ca2.85 Mn0.02 Fe0.39^2+ Mg0.12 Fe0.74^3+ Al0.61 Ti0.74 Si2.52 O12, Chemical composition of fassaitic pyroxene shows a range between Ca0.98 Fe0.03^2+ Mg0.48. Fe0.33^3+ Ti0.06 Al0.57 Si1.52 O6, and Ca1.00 Fe0.26^2+ Mn0.01 Mg0.37 Fe0.27^3+ Ti0.05 Al0.45 Si1.60, O6. Unit-cell dimension for schorlomite is determined, a=12.046Å. Genesis of the xenoliths is briefly discussed. |
| Type: | bulletin (article) |
| URI: | http://hdl.handle.net/2115/36698 |
| Appears in Collections: | Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy > Vol.XIX, No.4
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